| 1 | use std::mem::swap; |
| 2 | pub use crate::frame::{FrameType, NAFrameRef}; |
| 3 | |
| 4 | pub trait FrameReorderer { |
| 5 | fn add_frame(&mut self, fref: NAFrameRef) -> bool; |
| 6 | fn get_frame(&mut self) -> Option<NAFrameRef>; |
| 7 | fn flush(&mut self); |
| 8 | fn get_last_frames(&mut self) -> Option<NAFrameRef>; |
| 9 | } |
| 10 | |
| 11 | pub struct NoReorderer { |
| 12 | fref: Option<NAFrameRef>, |
| 13 | } |
| 14 | |
| 15 | impl NoReorderer { |
| 16 | pub fn new() -> Self { |
| 17 | Self { fref: None } |
| 18 | } |
| 19 | } |
| 20 | |
| 21 | impl FrameReorderer for NoReorderer { |
| 22 | fn add_frame(&mut self, fref: NAFrameRef) -> bool { |
| 23 | if self.fref.is_none() { |
| 24 | self.fref = Some(fref); |
| 25 | true |
| 26 | } else { |
| 27 | false |
| 28 | } |
| 29 | } |
| 30 | fn get_frame(&mut self) -> Option<NAFrameRef> { |
| 31 | let mut ret = None; |
| 32 | swap(&mut ret, &mut self.fref); |
| 33 | ret |
| 34 | } |
| 35 | fn flush(&mut self) { self.fref = None; } |
| 36 | fn get_last_frames(&mut self) -> Option<NAFrameRef> { None } |
| 37 | } |
| 38 | |
| 39 | #[derive(Default)] |
| 40 | pub struct IPBReorderer { |
| 41 | rframe: Option<NAFrameRef>, |
| 42 | bframe: Option<NAFrameRef>, |
| 43 | } |
| 44 | |
| 45 | impl IPBReorderer { |
| 46 | pub fn new() -> Self { Self::default() } |
| 47 | } |
| 48 | |
| 49 | impl FrameReorderer for IPBReorderer { |
| 50 | fn add_frame(&mut self, fref: NAFrameRef) -> bool { |
| 51 | if self.rframe.is_some() && self.bframe.is_some() { return false; } |
| 52 | let is_b = fref.get_frame_type() == FrameType::B; |
| 53 | if is_b && self.bframe.is_some() { return false; } |
| 54 | if is_b { |
| 55 | self.bframe = Some(fref); |
| 56 | } else { |
| 57 | std::mem::swap(&mut self.bframe, &mut self.rframe); |
| 58 | self.rframe = Some(fref); |
| 59 | } |
| 60 | true |
| 61 | } |
| 62 | fn get_frame(&mut self) -> Option<NAFrameRef> { |
| 63 | let mut ret = None; |
| 64 | if self.bframe.is_some() { |
| 65 | std::mem::swap(&mut ret, &mut self.bframe); |
| 66 | } |
| 67 | ret |
| 68 | } |
| 69 | fn flush(&mut self) { |
| 70 | self.rframe = None; |
| 71 | self.bframe = None; |
| 72 | } |
| 73 | fn get_last_frames(&mut self) -> Option<NAFrameRef> { |
| 74 | let mut ret = None; |
| 75 | if self.bframe.is_some() { |
| 76 | std::mem::swap(&mut ret, &mut self.bframe); |
| 77 | } else if self.rframe.is_some() { |
| 78 | std::mem::swap(&mut ret, &mut self.rframe); |
| 79 | } |
| 80 | ret |
| 81 | } |
| 82 | } |
| 83 | |